Quote from dumb_mother:
for ZF ZN ZB and UB i use the same as the ICS spreads do: 15:10:6:4 and i only trade intraday i never hold positions overnight
i posted the ratios before:
long fit = long 15 zf, short 10 zn
long nob = long 10 zn, short 6 zb
long bob = long 6 zb, short 4 ub
you can combine spreads if you want too:
long fob = long 15 zf, short 6 zb
long newb = long 10 zn, short 4 ub (my own name for this trade

)
shorting any would just be the opposite- the spread is named for whether you are long/short the shorter duration of the two products you are selling (ie. in the fit it is whatever position you take in the zf)
edit: and clearly you can do these in smaller ratios i just used the smallest numbers that you can hedge evenly throughout the curve, if you wanted to do smallest of each one, it's 3:2 fit, 5:3 nob, 3:2 bob)